Richard von Krafft-Ebing

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The first edition of Psychopathia Sexualis (1886), by Richard von Krafft-Ebing.

Krafft-Ebing's principal work is Psychopathia Sexualis: eine Klinisch-Forensische Studie (Sexual Psychopathy: A Clinical-Forensic Study), which was first published in 1886 and expanded in subsequent editions. The last edition from the hand of the author (the twelfth) contained a total of 238 case histories of human sexual behaviour.[3]

Psychopathia Sexualis is a forensic reference book for psychiatrists, physicians, and judges. Written in an academic style, its introduction noted that, to discourage lay readers, the author had deliberately chosen a scientific term for the title of the book and that he had written parts of it in Latin for the same purpose.

Psychopathia Sexualis was one of the first books about sexual practices that studied homosexuality/bisexuality. It proposed consideration of the mental state of sex criminals in legal judgements of their crimes. During its time, it became the leading medico–legal textual authority on sexual pathology.

The twelfth and final edition of Psychopathia Sexualis presented four categories of what Krafft-Ebing called "cerebral neuroses":

paradoxia, sexual excitement occurring independently of the period of the physiological processes in the generative organs

paraesthesia, perversion of the sexual instinct, i.e., excitability of the sexual functions to inadequate stimuli

The term "hetero-sexual" is used, but not in chapter or section headings. The term "bi-sexuality" appears twice in the 7th edition, and more frequently in the 12th.

There is no mention of sexual activity with children in Chapter III, General Pathology, where the "cerebral neuroses" (including sexuality the paraesthesias) are covered. Various sexual acts with children are mentioned in Chapter IV, Special Pathology, but always in the context of specific mental disorders, such as dementia, epilepsy, and paranoia, never as resulting from its own disorder. However, Chapter V on sexual crimes has a section on sexual crimes with children. This section is brief in the 7th edition, but is expanded in the 12th to cover Non-Psychopathological Cases and Psychopathological Cases, in which latter subsection the term paedophilia erotica is used.

Krafft-Ebing considered procreation the purpose of sexual desire and that any form of recreational sex was a perversion of the sex drive. "With opportunity for the natural satisfaction of the sexual instinct, every expression of it that does not correspond with the purpose of nature—i.e., propagation,—must be regarded as perverse."[10] Hence, he concluded that homosexuals suffered a degree of sexual perversion because homosexual practices could not result in procreation. In some cases, homosexual libido was classified as a moral vice induced by the early practice of masturbation.[11] Krafft-Ebing proposed a theory of homosexuality as biologically anomalous and originating in the embryonic and fetal stages of gestation, which evolved into a "sexual inversion" of the brain. In 1901, in an article in the Jahrbuch für sexuelle Zwischenstufen (Yearbook for Intermediate Sexual Types), he changed the biological term from anomaly to differentiation.

Although the primary focus is on sexual behavior in men, there are sections on Sadism in Woman, Masochism in Woman, and Lesbian Love. Several of the cases of sexual activity with children were committed by women.

Krafft-Ebing’s conclusions about homosexuality are now largely forgotten, partly because Sigmund Freud’s theories were more interesting to physicians (who considered homosexuality to be a psychological problem) and partly because he incurred the enmity of the Austrian Catholic Church when he psychologically associated martyrdom (a desire for sanctity) with hysteria and masochism.[12]

^Jens De Vleminck (2017). "Sadism and Masochism on the Procrustean Bed of Hysteria: From Psychopathia Sexualis to Three Essays on the Theory of Sexuality". Psychoanalysis and History. 19 (3): 381. doi:10.3366/pah.2017.0232 – via Edinburgh University Press.(subscription required)